Clarification of the dispersion mechanism of three typical chemical dispersants in lithium-ion battery (LIB) slurry--颗粒学报PARTICUOLOGY

Wang, Z., Wang, Z., Liu, X., Liu, X., Zhao, T., & Takei, M. (2023). Clarification of the dispersion mechanism of three typical chemical dispersants in lithium-ion battery (LIB) slurry. Particuology, 80, 90-102. https://doi.org/10.1016/j.partic.2022.11.013

Clarification of the dispersion mechanism of three typical chemical dispersants in lithium-ion battery (LIB) slurry

Zhilong Wang ^a, Zehua Wang ^a, Xiaodong Liu ^a, Xiayi Liu ^a, Tong Zhao ^a *, Masahiro Takei ^b

a Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, China
b Division of Artificial Systems Science, Graduate School of Engineering, Chiba University, Chiba, 2638522, Japan

10.1016/j.partic.2022.11.013

Volume 80, September 2023, Pages 90-102

Received 8 October 2022, Revised 2 November 2022, Accepted 16 November 2022, Available online 2 December 2022, Version of Record 1 March 2023.

E-mail: tongzhao@xaut.edu.cn

Highlights

• Polyethylene glycol octylphenyl ether can form PVDF-CB double layer around LiCoO₂ particles in LIB slurry.

• Polyethylene pyrrolidone can form locally aggregate LiCoO₂ network structure in LIB slurry.

• Carboxymethyl cellulose can form conductive paths and CB-coated LiCoO₂ network in LIB slurry.

Abstract

This paper mainly clarified the dispersion mechanism of three typical chemical dispersants which are polyethylene glycol octylphenyl ether (Triton X-100, T-100), polyethylene pyrrolidone (PVP) and carboxymethyl cellulose (CMC) within lithium-ion battery (LIB) slurry. Initially, the optimum amounts of T-100, PVP and CMC are selected from 0%, 0.5%, 1.5% and 2.5% by evaluating the impedance of LIB slurry in the case of adding each typical chemical dispersant with EIS method. Moreover, the impedance spectrum of three different slurry samples which are PVDF-NMP solution, LiCoO2 slurry and Carbon Black (CB) slurry with the optimum amount of each dispersant are also investigated. After using SEM and C element distribution images of LIB slurry to verify the correctness of the dispersion mechanism of each dispersant, it is concluded that the dispersion CMC with its optimum amount 1.5% is the best one to promote the formation of conductive paths and CB-coated LiCoO₂ network structure within LIB slurry, which has the considerably potential to improve the performance of LIB.

Graphical abstract

Keywords

Lithium-ion battery (LIB) slurry; Chemical dispersants; Electrochemical characterizations; Electrical impedance spectroscopy (EIS)

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